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Dr. Adel Mady Afify Mohammed :: Publications:

Title:
Biostratigraphy and stepwise extinctions of the larger foraminifera during Cenomanian (Upper Cretaceous) of Gebel Um Horeiba (Mittla Pass), west-central Sinai, Egypt
Authors: Orabi H.Orabi, Reefat A. Osman, Gamal M. El Qot & Adel M. Afify
Year: 2012
Keywords: Larger Foraminifera, Cenomanian, Biostratigraphy, Palaeoecology, Sinai, Egypt
Journal: Revue de Paléobiologie
Volume: 31
Issue: 2
Pages: 303-312
Publisher: Not Available
Local/International: International
Paper Link: Not Available
Full paper Adel Mady Afify Mohammed_Article 5.pdf
Supplementary materials Not Available
Abstract:

Ten benthic larger foraminifera species Cisalveolina cf. lehneri (Reichel, 1941), C. frassi (Gűmbel, 1872), Sellialveolina viallii Colalongo, 1963, Reticulinella reicheli (Cuvillier et al., 1969), Orbitolina (Mesorbitolina) texana (Roemer, 1849), Spiroloculina cenomana Chiocchini, 2008, Spirosigmoilina sp., Cuneolina cylindrica Henson, Palaeosigmoilopsis apenninica Chiocchini, 2008, and Praechrysalidina infracretacea Luperto Sinni, 1979 have been recorded from the Cenomanian sediments of west-central Sinai for the first time. Due to the scarcity of index fossils such as ammonites and planktonic foraminifera and the high-diversity of the larger foraminifera species, three biozones have been recorded during Cenomanian based on larger foraminifera. In addition, two step patterns extinctions of larger foraminifera have been observed in the Late Cenomanian shallow-water carbonates of the studied area. The first step (E1) occurs at the middle part of the larger foraminifera Praealveolina cretacea Zone and the second one (E2) occurs near the top of the same latter zone with low-diversity of miliolids and textularids. The latter two extinction events (E1 & E2) are correlated with the record of sea-level change of eustatic curve of Haq et al. (1988).

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